All six crew members aboard a B-52 bomber that crashed off Guam were killed, the Air Force said Wednesday, as the search effort shifted focus from rescue to recovery of the crew and pieces of the wreckage. Two bodies have been found. The Air Force, without elaborating, said in a news release that forensic specialists were trying to identify additional remains recovered. "Losing this bomber crew has been a tragedy felt by everyone here and across the Air Force," said Brig. Gen. Doug Owens, commander of the 36th Wing. The six crew members were identified as Maj. Christopher M. Cooper, 33, aircraft commander; Maj. Brent D. Williams, 37, navigator; Capt. Michael K. Dodson, 31, co-pilot; 1st Lt. Joshua D. Shepherd, 25, navigator; 1st Lt. Robert D. Gerren, 32, electronic warfare officer; and Col. George Martin, 51, flight surgeon.